from django.conf import settings

class DatabaseRouter:
    """
    数据库路由，将doc_manager应用的所有模型映射到document_db数据库
    """
    
    def db_for_read(self, model, **hints):
        if model._meta.app_label == 'doc_manager':
            return 'document_db'
        return None
    
    def db_for_write(self, model, **hints):
        if model._meta.app_label == 'doc_manager':
            return 'document_db'
        return None
    
    def allow_relation(self, obj1, obj2, **hints):
        if obj1._meta.app_label == 'doc_manager' or obj2._meta.app_label == 'doc_manager':
            return True
        return None
    
    def allow_migrate(self, db, app_label, model_name=None, **hints):
        if app_label == 'doc_manager':
            return db == 'document_db'
        return None